Patent application number | Description | Published |
20100117630 | DISPLACEMENT SENSING DEVICE - A compact sensing device capable of sensing a rotational angle and a rotational velocity, or a rectilinear moving distance and a moving velocity. A displacement sensing device that senses a rotational angle of a moving member rotation and a distance of a linear movement of the moving member, or senses an angular velocity of the moving member rotation and a velocity of a linear movement of the moving member, includes: a first movable member, moved together with the moving member by a linear movement of the moving member; a second movable member holding the first movable member in a rotatable manner, and rotated together with the moving member by rotation of the moving member; a first sensor outputting a signal in accordance with a linear movement of the first movable member; and a second sensor outputting a signal in accordance with a rotation of the second movable member. | 05-13-2010 |
20100259282 | DETECTOR FOR PROXIMITY SENSOR AND PROXIMITY SENSOR - A detector for a proximity sensor, includes: a sensing portion including a pair of sensing coils which has central axes along a direction intersecting with a moving direction of a sensed object moving in a predetermined moving path and is provided so as to interpose the moving path; a circuit block including a capacitor composing an LC resonant circuit with the sensing coils of the sensing portion and provided with an oscillator which oscillates the LC resonant circuit; and an electric connector composed of first connection terminals and a first conductor pattern that connect the sensing coils of the sensing portion in series, and second connection terminals and a second conductor pattern that connect the sensing coils to the oscillator. | 10-14-2010 |
20110304323 | POSITION SENSOR - The position sensor includes a moving member configured to be displaced in response to displacement of a measurement target, a resonant unit, an oscillation unit, a signal processing unit, an output unit, a signal absence detection unit, and a low-pass filter. The resonant unit includes a detection coil arranged to have inductance varied corresponding to displacement of the moving member. The resonant unit is configured to have a resonant frequency determined by the inductance of the detection coil. The oscillation unit is configured to output an oscillation signal having its magnitude oscillating at a frequency corresponding to the resonant frequency. The signal processing unit is configured to determine the displacement of the measurement target on the basis of the oscillation signal. The output unit is configured to output an output signal indicative of the displacement of the measurement target determined by the signal processing unit. The signal absence detection unit is configured to judge whether or not the oscillation signal is output from the oscillation unit. The signal absence detection unit is configured to, upon judging that the oscillation signal is not output from the oscillation unit, output a malfunction detection signal to the signal processing unit. The low-pass filter is interposed between the oscillation unit and the signal absence detection unit. The signal processing unit is configured to, upon receiving the malfunction detection signal, issue occurrence of malfunction. The low-pass filter is configured to have a cut-off frequency which passes the oscillation signal corresponding to the resonant frequency of the resonant unit in a normal condition, but blocks the oscillation signal output from the oscillation unit when the resonant unit sees an oscillation at an abnormal frequency. | 12-15-2011 |
20130021023 | POSITION SENSOR - A position sensor includes a detection coil printed on a surface of a substrate formed of a dielectric material; and a detection body arranged in an opposing relationship with the detection coil and displaced along a specified orbit with respect to the detection coil in response to a displacement of a target object. The position sensor detects the displacement of the target object based on an inductance of the detection coil varying depending on the displacement of the detection body. At least one of the detection coil and the detection body is formed into such a shape that a change rate of the inductance of the detection coil with respect to the displacement of the detection body is kept constant. | 01-24-2013 |
20130021043 | POSITION SENSOR - A position sensor includes a detector, an oscillation circuit, a signal processing circuit, and a resonance circuit having a detection coil and a capacitor. The oscillation circuit forms a negative feedback loop from: an amplitude detection circuit that detects an amplitude of an oscillation signal outputted from the resonance circuit; an integrating circuit that outputs a signal corresponding to a difference between a predetermined reference voltage and the amplitude of the oscillation signal; a negative conductance control circuit that, based on the output of the integrating circuit, controls the negative conductance of the oscillation circuit such that the amplitude of the oscillation signal is equals to the predetermined reference voltage; and an operational amplifier that adjusts such that the oscillation voltage of the resonance circuit is equal to the applied voltage of the negative conductance control circuit. | 01-24-2013 |
20130141155 | DETECTION DEVICE - A detection device includes a resonance unit having a coil and a capacitor, an oscillation unit for oscillating the resonance unit, and a signal processing unit for detecting the oscillation state of the resonance unit and outputting an object detection signal when oscillation is stopped. The signal processing unit intermittently executes a self-diagnosis mode by forcibly oscillating the oscillation unit to determine whether or not an abnormality occurs in the resonance unit. | 06-06-2013 |
20130314077 | DISPLACEMENT MEASUREMENT DEVICE - The displacement measurement device according to the present invention includes: a metal object movable in a moving direction within a moving plane; a measurement coil arranged such that an opposite area of a measurement coil surface opposite to the moving plane is varied with a movement of the metal object; and a correction coil arranged such that an opposite area of a correction coil surface to the moving plane is not varied irrespective of the movement of the metal object. The measurement coil and the correction coil are arranged such that the measurement coil surface and the correction coil surface are not overlapped with each other with regard to a plane parallel to the moving plane but a range occupied by the measurement coil in a coordinate axis along the moving direction and a range occupied by the correction coil in the coordinate axis are overlapped with each other. | 11-28-2013 |
20140035558 | SENSOR DEVICE AND SENSOR INTERFACE - A mode detector in a sensor interface is configured to detect a mode specified by a mode signal when an input signal received from a side of a first terminal is the mode signal. A communication portion in the interface transmits an electric signal, obtained from a sensor circuit, to a side of a second terminal when a mode detected with the detector is a sensor output mode. The communication portion receives an input signal from the side of the first terminal while transmitting an output signal to the side of the second terminal, when a mode detected with the detector is a communication mode. | 02-06-2014 |